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The Fuel Economy of an automobile relates to the distance traveled by a vehicle and the amount of fuel consumed. A consumption rate can be calculated by dividing the amount of fuel used by the distance traveled. Typical units include miles per gallon (MPG) or litters per 100km (l/km).

There are different alternatives used to approximate the actual performance of the vehicle. The fuel energy is required to overcome various losses; such as wind resistance, tire drag, and others; encountered while driving the vehicle. and giving power to the vehicle system, such as air conditioning and ignition, Various strategies can be employed for loss reduction at each of the maneuvers between the chemical energy in the fuel and the kinetic energy of the vehicle. The driver can also make an impact for the fuel economy, such as acceleration performance and braking energy.

Fuel Saving Devices

Fuel-saving devices are available for sale on the aftermarket with claims that they can improve fuel economy, exhaust emissions or obtaining optimal ignition. Examples of these are accessory drive modifications such as underdrive pulleys modify the amount of engine power that can be drawn; Magnets, that are mounted on vehicles' fuel lines improve fuel economy by aligning fuel molecules. Vapor devices include fuel heaters to increase or decrease turbulence in the intake manifold.